There are much better things on the market. Very high output Luxeon Star LED
drop-in conversion kits have been available for Mini Mags for few years. Much
brighter light than the original Mag bulb. And they're cheap for the class of
flashlight you get after the conversion. Lets you use the original AAs in
either alkaline or rechargable.

You can also get the Streamlight Jr. LED (better than a converted Mini Mag) for
around $30.

GTO(John)